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TroubleshootingRSS

ESX(i) Troubleshooting

“vSphere 5.5 ESXTOP quick overview for Troubleshooting” diagram available (running-system.com)

Last year I have published a diagram called “ESXTOP quick overview for Troubleshooting” with the most frequently-used ESXTOP metrics and thresholds. It was downloaded very often and there was a lot of positive feedback – so I decided to publish a revised ...
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Point-to-Point Tunneling Protocol (PPTP) connections may not work on ESXi 5.5 (2061834)

After upgrading to ESXi 5.5, the virtual machine providing Virtual Private Network (VPN)/Router/Firewall services is unable to connect to via Point-to-Point Tunneling Protocol. The virtual machine providing VPN/Router/Firewall is configured to use ...
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Verifying network links (1003724)

Network failure to ESX/ESXi host Complete or partial network outage Pinging the physical switch fails  Connection to ESX/ESXi host is down

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/var/log/wtmp grows rapidly and fills the ramdisk of the ESXi host (2019021)

A large number of login attempts to the ESXi host causes the /var/log/wtmp to grow and consume 100% of root ramdisk. The var/log/vobd.log. contains entries similar to:vobd.log:2012-02-01T11:16:28.798Z: [VisorfsCorrelator] 4132132662503us: [vob.vis ...
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Troubleshoot iSCSI TCP connectivity from ESXi with netcat (Rickard Nobel)

The ESXi port scanner: how to use the nc command to check if TCP ports on the iSCSI target are reachable. Many VMware administrators might not be aware of ESXi having a simple, but functional, port scanner utility built in. Netcat for ESXi can be used to ...
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Capturing a network trace in ESXi using Tech Support Mode or ESXi Shell (1031186)

This article provides information on capturing network traces in ESXi 4.0 Update 1, ESXi 4.1 and ESXi 5.x. You may want to capture the network traces to investigate network problems.

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VMKping ESXi 5.1 – select outgoing network adapter

When troubleshooting vSphere ESXi networking we have a new very useful option available in vmkping in ESXi 5.1 which adds the ability to select the outgoing adapter being used. If you would like to verify for example iSCSI or NFS connectivity it is very ...
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Identifying issues with and setting up name resolution on ESX/ESXi Server (1003735)

Unable to configure VMware High Availability (HA). Configuring VMware HA fails at about 97% completion. Configuring VMware HA fails between 85 to 91%. Reconfiguring VMware HA fails. Adding an ESX host to a cluster fails. Enabling VMware HA in a clu ...
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VMware vSphere Blog: ESXi Slow Boot with MSCS

This is an issue that has come up time and time again. The basic gist of the problem is that when there are Microsoft Cluster Service (MSCS) virtual machines deployed across ESXi hosts (commonly referred to as Cluster Across Boxes or CABs), the virtual ma ...
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Determining why a ESX/ESXi host was powered off or restarted (1019238)

A ESX/ESXi host is disabled (greyed out) and displays as Not Responding. A ESX/ESXi host is disabled (greyed out) and displays as Disconnected. Clients connected to services running in one or more virtual machines are no longer accessible. ...
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Installing and/or Updating the Fusion-IO Drivers on an ESXi Host… (That... Could be a Problem...)

We were fortunate enough to pick up some Fusion-IO IOcache cards to be implemented in our new infrastructure. In this case, Fusion-IO drivers on the ESXi box were slipstreamed into the install image. To check the driver version we do a "fio-status" comma ...
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Change to ICMP ping response behaviour in VMware ESXi 5.1

In ESXi 5.1, it is no longer possible to ping VMkernel interfaces other than the management VMkernel interface from client machines in other networks/VLANs.

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Recovering an ESX host from GRUB prompt

ESX host stops booting at GRUB prompt. The screen displays grub> , and it seems to be waiting for commands ESX host does not recover after the GRUB prompt The /boot/grub/grub.conf file has incorrect entries

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ESXCLI Basics: Configure Dump Collector Host

Another basic command, but may be useful in stateless environments with no local disk usable for a diagnostic partition. Here is a quick how-to.

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Forcing a Kernel Dump on a vSphere Host : The Purple Screen of Death

This is nothing new however I thought I’d share on how to force a PSOD on a vSphere host in case you were not aware. I had done this a while back but was unable to retrieve the information my self when searching. Thanks to @CianoKuraz & @lamw(http://w ...
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